Sleeve expansion of bolt holes in railroad rail. volume III - field experiment results
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1998-02-01
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Abstract:The bolt-hole cold-expansion process has been demonstrated by laboratory tests to significantly affect the initiation and propagation of fatigue cracks from rail bolt holes such that a reduction of the incidence of rail-bolt-holde failure in cold-expanded rail would be expected. A field-verification experiment was implemented in 1977 and reported in volume I of this report.
This volume contains the results of the field experiment, an examination of the effect of fatigue ration (R) on the observed laboratory fatigue-life improvement of cold-expanded bolt holes, an investigatin of crack growth of rails in a vacum environment, and a comparison of the fatigue performance of cold-expanded bolt holes with rail flashwelds.
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